There are some mistakes that you have done in here.First of all I would like to suggest you to start using error reporting using,

ini_set('display_errors', '1');
ini_set('display_startup_errors', '1'); 
error_reporting(E_ALL); 

If you have used error reporting from the beginning I believe you would have noticed all the issues that you are facing now.

1.You need to use the DB connection when you are using mysqli_query

 $link = mysqli_connect($DB_HOST, $DB_USER, $DB_PASS, $DATABASE);
  $result = mysqli_query($link,$query_option);

2.You are using the wrong value inside the while loop.

while($row = mysqli_fetch_array($result)) {
         echo "<option>".$row{'company'}."</option>";
    }

You are getting comName from the query so you have to use comName instead of company.

while($row = mysqli_fetch_array($result)) {
     echo "<option value=".$row{'comName'.">".$row{'comName'}."</option>";
}